1/* 2 * include/linux/nfsd/nfsfh.h 3 * 4 * This file describes the layout of the file handles as passed 5 * over the wire. 6 * 7 * Earlier versions of knfsd used to sign file handles using keyed MD5 8 * or SHA. I've removed this code, because it doesn't give you more 9 * security than blocking external access to port 2049 on your firewall. 10 * 11 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> 12 */ 13 14#ifndef _LINUX_NFSD_FH_H 15#define _LINUX_NFSD_FH_H 16 17# include <linux/types.h> 18#include <linux/nfsd/const.h> 19 20/* 21 * This is the old "dentry style" Linux NFSv2 file handle. 22 * 23 * The xino and xdev fields are currently used to transport the 24 * ino/dev of the exported inode. 25 */ 26struct nfs_fhbase_old { 27 __u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */ 28 __u32 fb_ino; /* our inode number */ 29 __u32 fb_dirino; /* dir inode number, 0 for directories */ 30 __u32 fb_dev; /* our device */ 31 __u32 fb_xdev; 32 __u32 fb_xino; 33 __u32 fb_generation; 34}; 35 36/* 37 * This is the new flexible, extensible style NFSv2/v3 file handle. 38 * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000 39 * 40 * The file handle starts with a sequence of four-byte words. 41 * The first word contains a version number (1) and three descriptor bytes 42 * that tell how the remaining 3 variable length fields should be handled. 43 * These three bytes are auth_type, fsid_type and fileid_type. 44 * 45 * All four-byte values are in host-byte-order. 46 * 47 * The auth_type field specifies how the filehandle can be authenticated 48 * This might allow a file to be confirmed to be in a writable part of a 49 * filetree without checking the path from it upto the root. 50 * Current values: 51 * 0 - No authentication. fb_auth is 0 bytes long 52 * Possible future values: 53 * 1 - 4 bytes taken from MD5 hash of the remainer of the file handle 54 * prefixed by a secret and with the important export flags. 55 * 56 * The fsid_type identifies how the filesystem (or export point) is 57 * encoded. 58 * Current values: 59 * 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number 60 * NOTE: we cannot use the kdev_t device id value, because kdev_t.h 61 * says we mustn't. We must break it up and reassemble. 62 * 1 - 4 byte user specified identifier 63 * 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED 64 * 3 - 4 byte device id, encoded for user-space, 4 byte inode number 65 * 4 - 4 byte inode number and 4 byte uuid 66 * 5 - 8 byte uuid 67 * 6 - 16 byte uuid 68 * 7 - 8 byte inode number and 16 byte uuid 69 * 70 * The fileid_type identified how the file within the filesystem is encoded. 71 * This is (will be) passed to, and set by, the underlying filesystem if it supports 72 * filehandle operations. The filesystem must not use the value '0' or '0xff' and may 73 * only use the values 1 and 2 as defined below: 74 * Current values: 75 * 0 - The root, or export point, of the filesystem. fb_fileid is 0 bytes. 76 * 1 - 32bit inode number, 32 bit generation number. 77 * 2 - 32bit inode number, 32 bit generation number, 32 bit parent directory inode number. 78 * 79 */ 80struct nfs_fhbase_new { 81 __u8 fb_version; /* == 1, even => nfs_fhbase_old */ 82 __u8 fb_auth_type; 83 __u8 fb_fsid_type; 84 __u8 fb_fileid_type; 85 __u32 fb_auth[1]; 86/* __u32 fb_fsid[0]; floating */ 87/* __u32 fb_fileid[0]; floating */ 88}; 89 90struct knfsd_fh { 91 unsigned int fh_size; /* significant for NFSv3. 92 * Points to the current size while building 93 * a new file handle 94 */ 95 union { 96 struct nfs_fhbase_old fh_old; 97 __u32 fh_pad[NFS4_FHSIZE/4]; 98 struct nfs_fhbase_new fh_new; 99 } fh_base; 100}; 101 102#define ofh_dcookie fh_base.fh_old.fb_dcookie 103#define ofh_ino fh_base.fh_old.fb_ino 104#define ofh_dirino fh_base.fh_old.fb_dirino 105#define ofh_dev fh_base.fh_old.fb_dev 106#define ofh_xdev fh_base.fh_old.fb_xdev 107#define ofh_xino fh_base.fh_old.fb_xino 108#define ofh_generation fh_base.fh_old.fb_generation 109 110#define fh_version fh_base.fh_new.fb_version 111#define fh_fsid_type fh_base.fh_new.fb_fsid_type 112#define fh_auth_type fh_base.fh_new.fb_auth_type 113#define fh_fileid_type fh_base.fh_new.fb_fileid_type 114#define fh_auth fh_base.fh_new.fb_auth 115#define fh_fsid fh_base.fh_new.fb_auth 116 117 118 119#endif /* _LINUX_NFSD_FH_H */ 120